Guides / Choosing a Supplier
Sourcing Semiconductor Parts in Vietnam: What to Check Before You Send a Drawing
September 21, 2026
Vietnam has a deep base of precision machining built around electronics assembly, motorcycle and appliance production. Semiconductor work sits on top of that base and asks for things the base was never built for: controlled cleanliness, a documented finishing chain and inspection records that survive an audit. Both are real, and they are not the same supplier.
This is the checklist to run before your drawing leaves the building.
Decide which kind of part you are buying
Equipment and chamber parts are bought by tool makers and their subcontractors. Quantities are low, documentation is heavy and qualification is long. Material choice and finish are driven by vacuum, plasma and process chemistry.
Assembly and test line parts are bought by plants and by OSAT operations. Jigs, fixtures, change parts and spares repeat on a fixed drawing, often against a short deadline. Delivery reliability and price stability matter as much as tolerance.
Mixing the two in one RFQ is the fastest way to get quotes you cannot compare. Say which one you are.
Check capability in this order
- Machines and capacity. Model, count and age tell you less than what is on the machines right now. Ask what the shop ran last month in your material and at your tolerance.
- The finishing chain. Hard anodize, electropolish, passivation and plating are almost always bought outside. Ask who does it, how far away and what happens when that supplier is late. A shop that cannot name its finisher is quoting a hope.
- Inspection. A CMM in the corner is not a capability. Ask to see a first article inspection report from a real job, with the drawing next to it.
- Cleaning and packing. Ask what the process is, step by step, for a part that goes into a cleanroom. If the answer is a plastic bag and a rubber band, this is a shop for frames and brackets, not for wafer handling.
- Export documents. A shop that has only ever delivered inside Vietnam will need a forwarder for your first shipment. That is workable, it just has to be priced and scheduled, not discovered in week six.
- Engineering communication. One person who reads a GD and T drawing and writes back in English saves more time than any machine on the list.
Put the real requirements on the drawing
Most failed first articles trace back to something the drawing never said.
| Write this | Or expect this |
|---|---|
| Surface finish in Ra with the area it applies to | A number applied everywhere, and a price that reflects it |
| Flatness and parallelism with the datum scheme | A part that measures fine feature by feature and rocks on the fixture |
| Finish type and thickness, and which faces are masked | Anodize in threads and bores, then a rework argument |
| Cleaning and packing level | Industrial packing, oil film and a contaminated part |
| Certificates and reports required | A part delivered with no traceability, and a new order to redo it |
Tolerance every feature to what it needs, not to a house default. On this kind of work an extra step of precision across a whole plate is usually the single largest avoidable cost.
Red flags
- A quote that comes back in an hour on a drawing with a cleanliness requirement. Nobody priced the cleaning.
- A capability list that includes everything and excludes nothing.
- A claimed cleanroom with no ISO class, no particle count and no procedure.
- Sample parts that look better than anything the shop could repeat in a lot of fifty.
- A price far under the others. Someone read the drawing wrong, and the difference comes back as a change order.
What a realistic first project looks like
Pick a part that hurts if it is late but does not stop the line if the first attempt fails. A jig plate, a bracket set or a repeat spare is a better first project than the one chamber part with a six week lead time and no alternative.
Run a first article, then a pilot lot at the real quantity. Measure delivery, not only dimensions. A shop that hits tolerance and misses dates twice is not a supplier, it is a rework queue.
When it works, write down what made it work and hand the same document to the second source. Qualification you cannot repeat is qualification you did once.
If you have a drawing ready now, send the RFQ and we will match it with shops that fit the part rather than shops that want the work.
Frequently asked questions
Can Vietnam shops handle vacuum chamber parts?
A small number can. The machining is rarely the limit. The limit is a repeatable cleaning process, a finishing chain that does not contaminate the part and inspection records the buyer can audit. Ask for those three before you ask for a price.
How long does qualification take?
Plan on a first article, a small pilot lot and then a production lot. For a jig plate that can be six to eight weeks. For chamber hardware with outside finishing it is usually longer, because every finish step adds a supplier that also has to be qualified.
Should I split the order across two shops?
For repeat line parts, yes. A second qualified source costs one extra qualification and removes the single point of failure that shuts a line down. For one off equipment parts it is rarely worth the paperwork.
Need a quote for this part?
Send the drawing. We match you with up to 3 shops in Vietnam and reply within 24 business hours.
Get matched with a supplierMore on choosing a supplier
- What an NDA Should Cover When Drawings Cross Borders
- Second Sourcing a Critical Machined Part Without Doubling the Work
- Vietnam, Taiwan or Malaysia for Machined Semiconductor Parts
- What to Put in an RFQ so the Quotes Are Comparable
All guides and the sourcing glossary.